Summary:
- Arachnids are a class of joint-legged invertebrates in the subphylum Chelicerata.
- They live mainly on land but are also found in fresh water and in all marine environments, except for the open ocean.
- There are over 100,000 named species, including many species of spiders, scorpions, daddy-long-legs, ticks, and mites.
- There may be up to 600,000 species in total, including unknown ones.
- Use the resource below to answer the questions that follow.